A014288 - cp's OEIS frontend

A014288 a(n) = floor(Sum_{k=0..n} k!/2), or floor( A003422(n+1)/2 ).

n	a(n)
0	0
1	1
2	2
3	5
4	17
5	77
6	437
7	2957
8	23117
9	204557
10	2018957
11	21977357
12	261478157
13	3374988557
14	46964134157
15	700801318157
16	11162196262157
17	189005910310157
18	3390192763174157
19	64212742967590157
20	1280663747055910157
21	26826134832910630157
22	588826498721714470157

[0, 1, 2, 5, 17, 77, 437, 2957, 23117, 204557, 2018957, 21977357, 261478157, 3374988557, 46964134157, 700801318157, 11162196262157, 189005910310157, 3390192763174157, 64212742967590157, 1280663747055910157, 26826134832910630157, 588826498721714470157]

cp's OEIS Frontend

A014288 a(n) = floor(Sum_{k=0..n} k!/2), or floor( A003422(n+1)/2 ).

Table of values

List of values